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The Muon Ionization Cooling Experiment (MICE) will perform a detailed study of ionization cooling to evaluate the feasibility of the technique. To carry out this program, MICE requires an efficient particle-identification (PID) system to identify muons. The Electron-Muon Ranger (EMR) is a fully-active tracking-calorimeter that forms part of the PID system and tags muons that traverse the cooling channel without decaying. The detector is capable of identifying electrons with an efficiency of 98.6%, providing a purity for the MICE beam that exceeds 99.8%. The EMR also proved to be a powerful tool for the reconstruction of muon momenta in the range 100--280 MeV/c.

Figure 13. Percentage of the electron sample tagged as a muon (beta) as a function of the loss (alpha) of real muons for different values on the cut rhoC. The black dot represents the optimal point of the curve. (PDF, jpg)

Figure 14. Percentage of the electron sample tagged as a muon (beta) as a function of the loss of real muons (alpha) for three choices of test statistic xi. The black dot is the optimal point regardless of the choice of test statistic. (PDF, jpg)

Figure 15. Percentage of the electron sample tagged as a muon (beta) versus the loss of real muons (alpha) in the multivariate analysis. The large black triangle is the optimal point. (PDF, jpg)

Figure 16. Percentage of electron contamination and muon loss for different ranges of momentum set at D2 (pD2). (PDF, jpg)

Figure 17. Muon range as a function of the momentum reconstructed from TOF->2. At 280 MeV/c and above, muons can traverse the entire detector without stopping, hence the plateau at R = 816 mm.(PDF, jpg)